Developer ToolsFree Tool

OpenAPI to TypeScript

Provided byDevBoltdevbolt.dev

Converts OpenAPI 3.x and Swagger 2.0 specs to TypeScript interfaces and operation types.

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About this tool

What OpenAPI to TypeScript does

OpenAPI to TypeScript Converter on DevBolt transforms OpenAPI 3.x and Swagger 2.0 specifications into ready-to-use TypeScript interfaces and operation types. Users paste their API spec in JSON or YAML and receive generated type definitions that include interfaces for data models, enums for allowed values, and API operation types for endpoints. The output can be downloaded as a .ts file or copied to the clipboard, providing immediate type safety for REST API integration without manual coding.

Step by step

How to use the DevBolt OpenAPI to TypeScript

  1. 1

    Paste your OpenAPI 3.x or Swagger 2.0 specification in JSON or YAML format into the input area

  2. 2

    Click the Convert to TypeScript button or press Ctrl+Enter to process the spec

  3. 3

    Review the generated TypeScript interfaces, types, and API operation types in the output pane

  4. 4

    Download the .ts file or copy the code to use in your project

Is it right for you

Best for

Backend developers and TypeScript users who consume external REST APIs or build services based on established OpenAPI contracts and want to automate type-safe client implementation.

Limitations

  • Everything runs in the browser with no server processing
  • No unit switching or output format customization beyond style options
  • Results depend on the completeness and correctness of the input specification
Questions

OpenAPI to TypeScript FAQ

Can I use this tool with a large OpenAPI specification file?
The converter processes specs directly in your browser, so very large files may take longer to parse, but the entire conversion happens locally without sending data to a server.
Does the tool support both JSON and YAML input formats?
Yes, the tool accepts OpenAPI specifications in both JSON and YAML formats, giving you flexibility based on how your API documentation is authored.
What happens with $ref references in my spec?
The tool resolves $ref pointers within the specification, following references to other schemas and producing clean type names so you don't have to manually track dependencies.
Can I customize how the generated TypeScript looks?
Yes, style options are available to control whether interfaces are exported, use type aliases, include JSDoc comments, mark fields as readonly, and set all fields as optional.
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